Given the distance between the focus (F) and directrix (line CD) is 65mm and the eccentricity is 3/4, draw an ellipse by marking points along the directrix that are 3/4 of the way from the focus to the directrix.
1. Draw an ellipse by general method, given distance of focus from
directrix 65mm and eccentricity ¾.
A
1’
E
C F
V 1
B
Given CF=65mm
Given, eccentricity=3/4. Therefore divide CF in 7 equal
parts and mark V at 3rd division from F
3. PROBLEM: A point moves in a plane in such a way that its distance from a fixed point is equal to its distance from a fixed line. The
distance between fixed point and the fixed line is 65 mm.
A
1’ E
2’
3’
4’
F
C D
1
2
3
4
B